$5+7y-9$
$y+6=7z+6$
$y'\:-6y=e^{2t}$
$0<x^2-7x+10$
$18-\left|2+\left(7-3-8\right)-10\right|$
$\frac{0.66}{0.6}$
$\left(3\sqrt{3}\right)^2$
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